الفهرس | Only 14 pages are availabe for public view |
Abstract The importance of increasing wheat production in Egypt needs no more emphasize. The yield of grains per unit area depends on number of tillers and number of spikes per unit area, number of grains per spike and the average weight of the grain. The life period of wheat plant expands for about 160 days during which all the developmental changes occur. Such period may be divided into two phases, namely the vegetative stage where number of tillers and number of spikes may be determined and the reporductive stage where number of grains per spike and grain weight may be affected. Growth of wheat grain, from initiation to maturity, has the more pronounced effect on the yield per unit area. During such period, i.e. grain filling period, the potential storage capacity of photosynthetes and their translocation to the developing grains are considerably affected by the environmental conditions prevailing during maturity period among which are water and nutrient supply. Water stress i.e. number of irrigations during the life period of wheat plant may affect considerably the capacity of the source to assimilate photosynthetes translocated to the sink, i.e. developing grains through filling rate, filling period and the effective period. Also, nitrogen status in the tissues of wheat plant may prolong and |